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Commit 1745de5e authored by Joerg Roedel's avatar Joerg Roedel
Browse files

dma-debug: add dma_debug_driver kernel command line 



This patch add the dma_debug_driver= boot parameter to enable the driver
filter for early boot.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 8a6fc708

Documentation/kernel-parameters.txt

+7 −0
Original line number Diff line number Diff line
@@ -646,6 +646,13 @@ and is between 256 and 4096 characters. It is defined in the file 
			DMA-API debugging code disables itself because the

			architectural default is too low.



	dma_debug_driver=<driver_name>

			With this option the DMA-API debugging driver

			filter feature can be enabled at boot time. Just

			pass the driver to filter for as the parameter.

			The filter can be disabled or changed to another

			driver later using sysfs.



	dscc4.setup=	[NET]



	dtc3181e=	[HW,SCSI]

lib/dma-debug.c

+18 −0
Original line number Diff line number Diff line
@@ -1109,3 +1109,21 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 
}

EXPORT_SYMBOL(debug_dma_sync_sg_for_device);



static int __init dma_debug_driver_setup(char *str)

{

	int i;



	for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {

		current_driver_name[i] = *str;

		if (*str == 0)

			break;

	}



	if (current_driver_name[0])

		printk(KERN_INFO "DMA-API: enable driver filter for "

				 "driver [%s]\n", current_driver_name);





	return 1;

}

__setup("dma_debug_driver=", dma_debug_driver_setup);